<template>
  <HomePanel title="热门品牌" sub-title="国际经典 品质保证" ref="target">
    <template #right>
      <a
        @click="index = 0"
        :class="{ disabled: index === 0 }"
        href="javascript:;"
        class="iconfont icon-angle-left prev"
      ></a>
      <a
        @click="index = 1"
        :class="{ disabled: index === 1 }"
        href="javascript:;"
        class="iconfont icon-angle-right next"
      ></a>
    </template>
    <div class="box" ref="box">
      <transition name="fade">
      <!-- 正常的数据 -->
      <ul v-if="result && result.length" class="list" :style="{ transform: `translateX(${-index * 1240}px)` }">
        <li v-for="item in result" :key="item.id">
          <RouterLink to="/">
            <img v-lazyload="item.picture" alt="" />
          </RouterLink>
        </li>
      </ul>
       <!-- 没有数据的时候临时添加骨架屏效果 -->
      <div v-else class="skeleton">
          <XtxSkeleton class="item" v-for="i in 5" :key="i" animated bg="#e4e4e4" width="240px" height="305px"/>
        </div>
        </transition>
    </div>
  </HomePanel>
</template>

<script>
import HomePanel from './home-pannel'
import { findBrand } from '@/api/home'
import { useLazyData } from '@/hooks'
import { ref, computed } from 'vue'

export default {
  name: 'HomeBrand',
  components: { HomePanel },
  setup () {
    // 自己封装的useLazyData函数
    const { result, target } = useLazyData(() => findBrand(10))

    // 记录当前的页码索引
    const index = ref(0)

    const list = computed(() => {
      return result.value.filter((item, i) => {
        if (index.value === 0) {
          // 获取第一页数据 前五条数据
          return i <= 4
        } else if (index.value === 1) {
          // 获取第二页数据 后五条数据
          return i > 4
        }
      })
    })

    return { list, result, target, index }
  }
}
</script>

<style scoped lang='less'>
.home-panel {
  background: #f5f5f5;
}
.iconfont {
  width: 20px;
  height: 20px;
  background: #ccc;
  color: #fff;
  display: inline-block;
  text-align: center;
  margin-left: 5px;
  background: @xtxColor;
  &::before {
    font-size: 12px;
    position: relative;
    top: -2px;
  }
  &.disabled {
    background: #ccc;
    cursor: not-allowed;
  }
}
.box {
  display: flex;
  width: 100%;
  height: 345px;
  overflow: hidden;
  padding-bottom: 40px;
    .skeleton {
    width: 100%;
    display: flex;
    .item {
      margin-right: 10px;
      &:nth-child(5n) {
        margin-right: 0;
      }
    }
  }
  .list {
    width: 200%;
    display: flex;
    transition: all 1s;
    li {
      margin-right: 10px;
      width: 240px;
      &:nth-child(5n) {
        margin-right: 0;
      }
      img {
        width: 240px;
        height: 305px;
      }
    }
  }
}
</style>
